Ballpoint pen



FIG. 1 is a perspective view of the front, left and top view of a ballpoint pen showing our new design;

FIG. 2 is a front view thereof; the rear side view being mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof. 

The ornamental design for a ballpoint pen, as shown and described. 